update comments in Windows's get_process_cwd() which were erroneously referring to cmdline code
update comments in Windows's get_process_cwd() which were erroneously referring to cmdline code

mindw/psutil,tomprince/psutil,jorik041/psutil,jorik041/psutil,0-wiz-0/psutil,mrjefftang/psutil,msarahan/psutil,jamesblunt/psutil,msarahan/psutil,tomprince/psutil,cloudbase/psutil,landryb/psutil,mindw/psutil,qbit/psutil,giampaolo/psutil,landryb/psutil,mindw/psutil,tomprince/psutil,qbit/psutil,packages/psutil,Q-Leap-Networks/psutil,cloudbase/psutil,msarahan/psutil,mindw/psutil,jamesblunt/psutil,giampaolo/psutil,packages/psutil,Q-Leap-Networks/psutil,0-wiz-0/psutil,cloudbase/psutil,tomprince/psutil,landryb/psutil,mrjefftang/psutil,landryb/psutil,mrjefftang/psutil,landryb/psutil,qbit/psutil,jorik041/psutil,mindw/psutil,tomprince/psutil,jamesblunt/psutil,packages/psutil